BU45K402G-TL

Overview

The BU45K402G-TL is a voltage detector IC from the ROHM BU45/BU46 series, designed for monitoring single-input power supplies. It features a fixed threshold voltage of 4.0 V with an accuracy of ±1%. The device operates within a supply voltage range of 0.6 V to 6 V and draws a typical operating current of 2.8 µA. It provides an open-drain output with a fixed reset delay time of 200 ms. The component is housed in an SSOP-3 package and supports an operating temperature range from -40°C to +105°C.

Feature Summary

• Fixed threshold voltage detection without external capacitor requirements due to built-in counter timer delay circuit
• Low current consumption suitable for battery-powered applications
• Open-drain output configuration compatible with various logic families

Applications

• Microprocessor system reset circuits
• Battery voltage monitoring
• Power supply supervision in portable devices

Procurement Notes

Verify the current lifecycle status before procurement, as this part is marked Not Recommended for New Designs (NRND). Confirm availability through authorized distributors or check for recommended replacement parts such as the BD5240G-1TR if new design implementation is required. Ensure the SSOP-3 package compatibility matches your PCB footprint.

Selection Notes

Select this component when a fixed 4.0 V threshold with high precision is required for single-channel voltage monitoring. Consider the 200 ms fixed delay and open-drain output characteristics against system timing requirements. Evaluate the low quiescent current for energy efficiency needs. Verify that the SSOP-3 package fits the available board space and thermal constraints.

Part Context

This voltage detector belongs to the BU45/BU46 series, which offers high accuracy and low current consumption. The series eliminates the need for external capacitors for delay setting by integrating the timer circuit internally. The BU45K402G-TL specifically targets applications requiring precise under-voltage detection with minimal component count.

Replacement Considerations

The BD5240G-1TR is listed as a similar specification replacement. Note differences include adjustable delay versus fixed delay, different package (SSOP-5 vs SSOP-3), and varying current consumption specifications.